Solaris doesn't have an easy way to retrieve the MAC address of the client
that is soliciting the DHCPv6 IP address. This fix uses a simple way to
retrieve the client MAC address from the client's EUI64 link-local address.


*** dnsmasq-2.68/src/dhcp6.c	2013-12-08 07:58:29.000000000 -0800
--- NEW/src/dhcp6.c	2015-02-23 18:33:30.937299563 -0800
***************
*** 231,236 ****
--- 231,253 ----
  
  void get_client_mac(struct in6_addr *client, int iface, unsigned char *mac, unsigned int *maclenp, unsigned int *mactypep)
  {
+ #ifdef HAVE_SOLARIS_NETWORK
+ /* Solaris does not have an easy way to retrieve MAC address for a given IPv6 address from the kernel.
+    For now the following workaround should work for OpenStack's needs. */
+   uint8_t *addr6;
+ 
+   *maclenp = ETHER_ADDR_LEN;
+   *mactypep = ARPHRD_ETHER;
+   /* Take the EUI64 based client's link-local address and convert it to client's MAC address.
+      For example: from fe80::f816:3eff:fe5c:df43 link-local address we arrive at fa:16:3e:5c:df:43 */
+   addr6 = client->s6_addr;
+   mac[0] = addr6[8] ^ 0x2;
+   mac[1] = addr6[9];
+   mac[2] = addr6[10];
+   mac[3] = addr6[13];
+   mac[4] = addr6[14];
+   mac[5]= addr6[15];
+ #else
    /* Recieving a packet from a host does not populate the neighbour
       cache, so we send a neighbour discovery request if we can't 
       find the sender. Repeat a few times in case of packet loss. */
***************
*** 276,281 ****
--- 293,299 ----
  
    *maclenp = mac_param.maclen;
    *mactypep = ARPHRD_ETHER;
+ #endif /* HAVE_SOLARIS_NETWORK */
  }
      
  static int find_mac(int family, char *addrp, char *mac, size_t maclen, void *parmv)